James hart robertson



{No Model.) J. H. ROBERTSON.

WRITING TELEGRAPH.

No. 543,428. Patented'July 23, 1895.

- UNITED STATES PATENT OFFICE.

JAMES HART ROBERTSON, OF BROOKLYN, YORK, ASSIGNOR TO WILLIAM E. GUMR OFSAME PLACE.

WRITING-TELEGRAPH.

SPECIFICATION forming part of Letters Patent No. 543,428, dated July 23,1895.

Application filed March 21,1895. Serial No. 542,622- (No model.)

To all whom it may concern.-

Be it known that I. JAMES HART ROBERT- sON,a citizen of the UnitedStates, and a resi dent of Brooklyn, in the county of Kings and.

State of New York, have invented certain new and useful Improvements inthe Transmission of Autographic Signs, of which the following;

is a specification.

My invention relates to Writing-telegraphs of the character described inmy application.

for patent, Serial No. 532,891.

In this application I employ, as in application Serial No. 542,621, acondenser and polarized relay bridged across the incoming line-wires atthe receiving end to control thepen-lifting mechanism, and also anauto-- matic commutating apparatus at the transmitting end and twomain-line wires only, as

in the aforesaid application.

The object of my present invention is to adapt the apparatus of myaforesaid application, Serial No. 512,621, for a system where pulsationsof successively-opposite polarity are sent over the line-wires insteadof impulses, as in application Serial No. 542,621. I accomplish thisobject by the means hereinafter described and made the subject of claimsat the end of this specification.

In the accompanying drawing, forming a part of this specification, thereis illustrated,=

diagrammatically, apparatus and connections adapted for carrying out myinvention.

Referring to the drawing, T indicates the transmitting apparatus, R thereceiving apparatus, and A B the main-line wires connecting saidapparatus.

O D indicate the circuit-interrupters at the transmitter, and 2 thetransmitting-pen me-- chanically connected to the circuit-interruptersby arms 3 3.

E indicates the commutating device.

The construction of the circuit-interrupters O D and commutator E isfully explained in my aforesaid application and will therefore not bedescribed herein.

To adapt the mechanism for sending impulses of successively-oppositepolarity over the main line I introduce at the transmitter theresistances 4 4.. be located as shown or elsewhere in the connectionsbetween the transmitting apparatus and the main lines. At the receiver Iintroduce in main line A the magnets 5, 6, and 7,

These resistances may and in main line B the magnets 5 6 and 7 Thedrawing also shows at the receiver a con- {denser 8 and polarized relay9, bridged across the incoming line-wires for controlling thepen-lifting mechanism.

(Not here shown.) The mechanism at the-receiver which gives the lateralmotions of writing is arranged in proper relation to magnets 6 7 and 67*.

The form of this mechanism will be preferably that shown in myapplication, Serial No.

542,621. The present drawing shows at 12 the e'scapement of the feedingmechanism, 'and instead of the'polarized magnet of my previousapplication, by which the movement of the feed-wheel is reversed, themagnets 6 7 are made use of.

The said magnets will be arranged at the respective ends of thefeed-wheel shaft and adapted to attract said shaft in either direction.The batteries at the transmitter are indicated by 10 10 and 11 11 Themagnet 5, which is always in circuit with line A, serves to cut out orin the magnets (5 or 7, according as the transmitter-arm co-operatingwith circuit-interrupter controlling line A is moved to or from theoperator. The magnet 5 in circuit with .line B, serves alike function inthe movements taking place on line B. i

The operation of the commutator E is identically the same as explainedin my former application herein mentioned. The batteries used to sendimpulses over line A for giving one of the lateral movements of writing,as well as the line B and ground, are electrically connected with thecommutator in the same manner as explained in the aforesaid application,and the function of the commutator in transforming the main lines andbatteries into a single metallic circuit is as described in the saidapplication.

The impulses on the mainline A pass from.

batteries 10 or 10*, according to whether piv oted contact-maker12 isincontact with points 13 or 14. The movement of the transmitterpen putsthe contact-maker 12 in contact with y 13 or 14, and all impulsesthesame being successively opposite in polarity are from ground 15 tocontact 16, wire 17 to batteries 10 10, then to contact-points 13 14,respectively, through contact 18 of circuit-interrupter C, to contacts19 or 20 to spring 21,'and by way of contact 21 to line A,--thence;toelectromagnet 5, to polarized magnet 12, then through either magnet 6 or7 to ground. As seen in the drawing, the armature of electromagnet 5 isshown away from the pole of the said magnet, its extension being incontact with point 22. The impulses sent over lineA now pass throughmagnet 5, wire 23, polarized magnet 12*, electromagnet 6, wire 24,armature of magnet 5, which is in contact with point 22, then throughwire 25 to ground. In this condition of the system the resistance 4 atthe transmitter is in the circuit of line A.

When the resistance 4 is cutout by reversing the movement of thetransmitting-arm the magnet 5 is energized sufficiently to change theposition of the armature of said magnet, throwing its extension incontact with point 26, the impulses in this position of said armaturebeing from line A to magnet 5, through wire 23, to polarized magnet 12,thence through line 27 to contact-point 26, through armature ofelectromagnet 5 by way of wire 24, through electromagnet 7- to ground15. In either position of the armature of electromagnet 5, whether incontact with point 22 or 26, the current will pass through both magnets6 and 7 of the reversing mechanism, but a small portion only through oneof them, the bulk of the current passing through that magnet whichinfluences the feed-shaft for the time being. When the bulk of thecurrent is passing through the magnet 7 the movement of the pen is inaccordance with the movement of that side of the reversible gearcontrolled by said magnet, and a contrary movement of the reversiblegear takes place when the bulk of the current passes throughelectromagnet 6.

When the resistance 4 is cut out it is desirable to'have the armature ofelectromagnet 5 come into magnetic contact with the core of said magnet,and the parts are so adjusted as to effect this object. If this were notthe case, when the impulses are sent over the line the armature of saidmagnet would be liable to be held in a state of suspension and nocontact made with the desired contact-point at the proper time.

Where it is provided that there shall be positive contact made betweenthe armature and the core of the magnet, the residual magnetism in saidcore is sufficient to hold the armature in contact with the core againstthe pull of the spring 28. It is, of course, understood that the motionsor movements in line B are similar to those above explained withreference to line A.

In this application I have not broadly claimed the fundamentalcombinations which have made it possible to produce a writingtelegraphsystem in which only two wires join the communicating-stations,and inwhich the fundamental telautographic operations of moving thereceiver-pen and controlling the direction of its motion, lifting andlowering this pen and shifting the receiver-paper, are eifected byactual currents transmitted over the line-wires, both positive andnegative currents being used, since these are broadly claimed in myother application for Letters Patent of the United States, filed January9, 1894, renewed December 24:, 1894, Serial No. 532,891, which, it isintended, shall issue on the same day with this application.

Having thus described my invention, What I claim as new, and desire tosecu re by Letters Patent, is-

1. In a writing telegraph transmitter, the combination of a transmitterpen and mechanism operated thereby for controlling the connection toline, comprising a circuit interrupter for controlling the connection toline, and a contact maker for connecting the line up through aresistance or around the same, according to the direction of movement ofthe transmitter pen, substantially as set forth.

2. In a writing telegraph transmitter, the combination of a transmittingpen and mechanism operated thereby for controlling the connection toline, comprising a circuit interrupter constructed to send alternatingpulsations to line, and a contact maker for connecting the line upthrough a resistance or around the same, according to the direction ofmovement of the transmitter pen, substantially as set forth.

3. In Writing telegraphs, a resistance arranged at the transmitter,through which the impulses made by'only one of the movements (either theforward or the backward) of the transmitting pen pass into a main linewith a connecting line Without a resistance for the other impulses, incombination with a controlling magnet at the receiver, which controlsthe reversing magnets of the feeding mechanism on that line,substantially as set forth.

4. In writing telegraphs, two resistances arranged at the transmitterthrough which the impulses made byonly one of the movements of thetransmitting pen (either the forward or the reverse), pass into the mainlines, and connecting lines without resistances for the impulses of theopposite movements, in combination with two controlling magnets at thereceiver which control the reversing magnets of the feeding mechanism oneach line, substantially as set forth.

5. In writing telegraphs two contact points co-operating with thereversing arm of a circuit interrupter, one of said contact pointselectrically connected to a main line wire and the other contact pointalso electrically connected to the same line wire through a resistance,in combination with a controlling magnet at the receiver, which controlson that line the feeding mechanism of the receiving pen, substantiallyas set forth.

Signed at New York, in the county of New York and State of New York,this 2d day of February, A. D. 1895.

JAMES HART ROBERTSON.

\Vitnesses:

F. J. EMLEY, J. R. SHUMAKER.

IIO

